It was a surprise it was Joe's son who held camera yesterday during the interview!
After calculating the spot size during the beam propagation, I found the spot size in the sample would be around 9mm, which was much larger than the aperture of the objective. The position of the objective was on the way before the beam even reached the sample. If my calculations were correct, we might have to change the beam expanding process to decrease the original radius of the laser beam.
We found the exposure time was actually 2 ^ n sec (n is the scale on Matlab); thus we can just set a relatively long exposure time and capture the laser beam in a very dark room. So we can see the final integrated light on camera.
Next week I will work on decreasing the spot size and testing more on the exposure time.
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